problem display current location with custom SpatialReference

lasinh — Sun, 21 Jul 2019 16:07:59 GMT

i use sdk runtime arcgis for android to show current location on the map but location incorrect; below is my custom SpatialReference

Spatial Reference: PROJCS["VN-2000",GEOGCS["GCS_VN_2000",DATUM["D_VN_2000",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",107.75],PARAMETER["Scale_Factor",0.9999],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]],VERTCS["Hon_Dau_1992",VDATUM["Hon_Dau_1992"],PARAMETER["Vertical_Shift",0.0],PARAMETER["Direction",1.0],UNIT["Meter",1.0]]

Re: problem display current location with custom SpatialReference

MarkBaird — Sun, 21 Jul 2019 17:48:03 GMT

How are you using the spatial reference?

I'm assuming you map is in another spatial reference and you are trying to project a point in your custom spatial reference.

Have you looked at the GeometryEnging.project methods?

Need a bit more information on what you are doing here to help.

Re: problem display current location with custom SpatialReference

lasinh — Sat, 11 Dec 2021 10:51:09 GMT

i want to display the location on the map, i new map with:

ArcGISTiledLayer usaLayer = new ArcGISTiledLayer(getResources().getString(R.string.map_layer));

map = new ArcGISMap(SpatialReference.create(getResources().getString(R.string.wkid)));

and show location but location deviate about 300m from the current location; my code

 map = new ArcGISMap(SpatialReference.create(getResources().getString(R.string.wkString)));
       // Viewpoint viewPoint1 = new Viewpoint(new Point(433214.603,1211184.161, map.getSpatialReference()), 1000000);

       // map.setInitialViewpoint(viewPoint1);
       // map = new ArcGISMap();
        map.getBasemap().getBaseLayers().add(usaLayer);
       
       
        mMapView = (MapView) findViewById(R.id.mapView);
        BackgroundGrid backgroundGrid = new BackgroundGrid(Color.WHITE,Color.WHITE,0,2);
        mMapView.setBackgroundGrid(backgroundGrid);
        mMapView.setMap(map);

      Viewpoint viewPoint = new Viewpoint(new Point(433214.603,1211184.161, map.getSpatialReference()), 1000000);
       mMapView.setViewpoint(viewPoint);
      // map.setInitialViewpoint(view);
      
        mMapView.setAttributionTextVisible(false);

mLocationDisplay = mMapView.getLocationDisplay();
        mLocationDisplay.addDataSourceStatusChangedListener(new LocationDisplay.DataSourceStatusChangedListener() {
            @Override
            public void onStatusChanged(LocationDisplay.DataSourceStatusChangedEvent dataSourceStatusChangedEvent) {

                // If LocationDisplay started OK, then continue.
                if (dataSourceStatusChangedEvent.isStarted())
                    return;

                // No error is reported, then continue.
                if (dataSourceStatusChangedEvent.getError() == null)
                    return;
                // If an error is found, handle the failure to start.
                // Check permissions to see if failure may be due to lack of permissions.
                boolean permissionCheck1 = ContextCompat.checkSelfPermission(MainActivity.this, reqPermissions[0]) ==
                        PackageManager.PERMISSION_GRANTED;
                boolean permissionCheck2 = ContextCompat.checkSelfPermission(MainActivity.this, reqPermissions[1]) ==
                        PackageManager.PERMISSION_GRANTED;

                if (!(permissionCheck1 && permissionCheck2)) {
                    // If permissions are not already granted, request permission from the user.
                    ActivityCompat.requestPermissions(MainActivity.this, reqPermissions, requestCode);
                } else {
                    // Report other unknown failure types to the user - for example, location services may not
                    // be enabled on the device.
                    String message = String.format("Error in DataSourceStatusChangedListener: %s", dataSourceStatusChangedEvent
                            .getSource().getLocationDataSource().getError().getMessage());
                    Toast.makeText(MainActivity.this, message, Toast.LENGTH_LONG).show();

                    // Update UI to reflect that the location display did not actually start
                    mSpinner.setSelection(0, true);
                }
            }
        });
// Populate the list for the Location display options for the spinner's Adapter
        ArrayList<ItemData> list = new ArrayList<>();
        list.add(new ItemData("", R.mipmap.locationdisplaydisabled));
        list.add(new ItemData("", R.mipmap.locationdisplayon));
        list.add(new ItemData("", R.mipmap.locationdisplayrecenter));
        list.add(new ItemData("", R.mipmap.locationdisplaynavigation));
        list.add(new ItemData("", R.mipmap.locationdisplayheading));
        SpinnerAdapter adapter = new SpinnerAdapter(this, R.layout.spinner_layout, R.id.txt, list);
        mSpinner.setAdapter(adapter);
        mSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

                switch (position) {
                    case 0:
                        // Stop Location Display
                        if (mLocationDisplay.isStarted())
                            mLocationDisplay.stop();
                        break;
                    case 1:
                        // Start Location Display
                        if (!mLocationDisplay.isStarted())
                            mLocationDisplay.startAsync();
                        break;
                    case 2:
                        // Re-Center MapView on Location
                        // AutoPanMode - Default: In this mode, the MapView attempts to keep the location symbol on-screen by
                        // re-centering the location symbol when the symbol moves outside a "wander extent". The location symbol
                        // may move freely within the wander extent, but as soon as the symbol exits the wander extent, the MapView
                        // re-centers the map on the symbol.
                        mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
                        if (!mLocationDisplay.isStarted())
                            mLocationDisplay.startAsync();
                        break;
                    case 3:
                        // Start Navigation Mode
                        // This mode is best suited for in-vehicle navigation.
                        mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.NAVIGATION);
                        if (!mLocationDisplay.isStarted())
                            mLocationDisplay.startAsync();
                        break;
                    case 4:
                        // Start Compass Mode
                        // This mode is better suited for waypoint navigation when the user is walking.
                        mLocationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.COMPASS_NAVIGATION);
                        if (!mLocationDisplay.isStarted())
                            mLocationDisplay.startAsync();
                        break;
                }
            }
            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });

Everything works fine, but the location service is not correct

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problem display current location with custom SpatialReference

Re: problem display current location with custom SpatialReference

Re: problem display current location with custom SpatialReference